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gaia/apps/email/test/marionette/lib/debug.js

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+'use strict';
+/*global module, console, process */
+
+// Run a test with DEBUG=true in front to get console listing of
+// helper method calls:
+// DEBUG=true ./bin/gaia-marionette whatever_test.js
+var debug = process.env.DEBUG;
+
+module.exports = function(logPrefix, obj) {
+
+  if (!debug) {
+    return;
+  }
+
+  // Optionally log all calls done to prototype methods. Uncomment this
+  // section to get traces when trying to debug where flow gets stuck.
+  Object.keys(obj).forEach(function(key) {
+    var desc = Object.getOwnPropertyDescriptor(obj, key);
+    if (!desc.get && !desc.set && typeof obj[key] === 'function') {
+      var oldMethod = obj[key];
+      obj[key] = function() {
+
+        var args = Array.prototype.slice.call(arguments, 0).map(function(arg) {
+          return String(arg);
+        }).join(', ');
+
+        console.log(logPrefix + '.' + key + '(' + args + ')');
+        return oldMethod.apply(this, arguments);
+      };
+    }
+  });
+};